ROCHESTER — Mayo Employees Federal Credit Union is expanding in Rochester and La Crosse with new branches. MEFCU announced this week that it is planning to open its seventh Rochester branch at Suite 101 of the Chateau Center at 3456 East Circle Drive NE. While this planned location will give the Mayo Employees Federal Credit Union seven branches in Rochester, the credit union is also working on a new project in Wisconsin. The plan is for the new center to replace the existing office building located at 605 West Ave. S.The new building is expected to be completed in December. The former MEFCU office will be demolished once the new one opens.